Rolf Wallin (born 7 September 1957) is a Norwegian composer, trumpeter and avant-garde performance artist. Biography Wallin was born in Oslo, where he studied with Finn Mortensen and Olav Anton Tho
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ef398cce5093bea5b0430b55dee03aa069990360f2d5138880d6b8f902b8569. Chain 2 (Bitcoin): anchored in block 953985 (2026-06-16T18:03:53Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2dfca77f-1d51-4489-aaac-dbf6007ef8c4.json and https://artists.proofprofile.net/proofs/artist/2dfca77f-1d51-4489-aaac-dbf6007ef8c4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rolf Wallin: Five Seasons, Stride & Other Orchestral Works